I've stayed at Tokyo Stay several times over the past 2 years traveling in Japan and I think the rooms are quite sufficient for a business trip. The rooms are typical size for the area but having the washer/dryer and kitchen made up for so much. I was able to pack much lighter and brought a carry on and backpack for 14days. They provide shampoo, conditioner and body wash as well as any other toiletries you made need - brush, razor, toothbrush and toothpaste. They also provide a sleeping gown and slippers - so even less to pack. Bring less but pack a small ziploc of powdered soap so you can do laundry. If you want internet bring a LAN cable - they don't have wifi. If you forget it, no worries - you can borrow one from the front desk.

When I arrived at the hotel I inquired about getting a larger room as the single A room type was too cramped to myself and one piece of luggage. I've stayed in other hotels in Tokyo so I am knowledgeable of the room sizes being smaller than typical western standards. They told me that because I booked through a travel agent they could not change the room type. I spoke to management that I would pay any additional upgrade charges but in their polite way of course told me NO, not allowed. Besides the room being unlivable cramped, the toilet leaked water, their was urine from the previous guest on the bathroom floor, internet in the room did not work, bed an pillows were horrible making it difficult to get any sleep and the room faces the LOUD trains.
I did however like the FREE breakfast at Johnathan's Family Restaurant, they were very nice, food was prepared with care and were open 24 hours which is also nice for a late night snack.
Overall my experience with Tokyu Stay Shibuya Shin- Minimaguchi was POOR and I would never stay there nor would I recommend the hotel to friends

Good size room for Tokyo, located very close to the train station and near the Shibuya centre making is very convenient to get around. Lots of shopping and eating joints close by.
The breakfast is in an attached restaurant and it was not great, but otherwise nice place to stay in, with the included washing machine and cooking facilities in the room.

Stayed for 4 nights in a single 'D' room. The hotel is located on a quiet street, just a short walk away from the new south exit of shibuya station.. Exited through the main exit and ended up walking about 10mins to the hotel. Would recommend the hotel if you would like it to be near to where the main shopping street (about 5 mins walk) is without the disturbance of traffic and street noise. If you are taking the Narita Express(NEX) to Narita Airport, this would be a good place to consider as the station is just below the new south exit of shibuya station. Although the towels are changed everyday, bed making services and sheet changing services are not included. Nevertheless, the breakfast menu(5 set menus) at the restaurant (jonathan's) serves delicious toast.